Balanced variable delivery pump or blower



sept. 4, 1934.

u l. B. LAsKowlT'z BALANCED VARIABLE DELIVERY PUMP OR BLOWER 3Sheets-Sheet 2 Filed Feb. 1e, 19:51

INVENToR'.

ATTORNEY Sepp, 21934. i. s. LAsKowlTz BALANCED VARIABLE DELIVERY PUMP ORBLOWER Filed Feb. 1e. y1951 s sheets-sheet 5 i NVENTOR les PatentedSept. 4, 1934 I BALANCED VARIABLE DELIVERY PUBIP OR BLOWER v Isidor B.Laskowitz, Brooklyn, N. Y. Application February 16, 1931, Serial No.516,251

Claims.

The present invention relates to improvements in pumps or blowers andmore particularly to that type of pump or blower wherein the delivery ordischarge of the iiuid may be varied 5 from a maximum to zero, with themotor, engine or other prime mover operating at a constant speed. Afurther, and important object is to provide a pump or blowerconstruction wherein the de# 210 livery'or discharge may be reversed andthe quantity of flow varied from the maxmumto Zero in the reversedirection, with the motor, engine or other prime mover operating at aconstant speed and in the same direction as before the reversal of thevdelivery or discharge.

Another important object is to provide a pump or blower constructionthat is statically and dynamically balanced so as to reduce the effortrequired to operate the mechanism for varying the delivery or dischargeof the pump or blower. A further object is to provide a structure of theabove mentioned character that includes a casing having alined inlet andoutlet openings, oppositely rotating propellers being arranged centrallywithin the' casing, the propellers being mounted upon a. swingablehousing, the actuating means for the latter being located exteriorly ofthe casing, whereby the propellers may be .positioned in any desiredangular position so that the thrust may be caused to act in an inclineddirection. A further and salient object of the present invention is toprovide a balanced variable delivery pump or blower of the abovementioned character' that includes a pair of oppositely rotatingpropellers or impellers mounted for rotation Within the casing and beingfurther adapted to be positioned at any predetermined angle ofinclination to vary the quantity of delivery from a maximum to zero andalso to eiect the re.-

verse directional flow of the `fluid, and this with In the accompanyingdrawings, wherein like (Cl. 10a-37) reference characters designatecorresponding parts throughout the several views:

Figure 1 is a horizontal cross sectional view through the-balancedvariable delivery pump or blower, showing the internal mechanism, aswell as a portion of the means for varying the angle at which thepropeller unit may be positioned, the section being taken substantiallyon the line 1-1 of Figure 2; y

Figure 2 is a vertical sectional view taken ap- 65 proximately on theline 2-2 of Figure 1, looking in the direction of the arrows; and

Figure 3 is a sectional view taken at right angles to Figure 2 on theline 3-3 of Figure 1.

In the drawings, wherein for the purpose of dicated by the arrows inFigure 3, the respective openings may be utilized either as inlet oroutlet openings, depending upon the direction of cw of the liquid orgas. Suitable flanges 5-are formed on the'inlet and outlet openings 4for securing or.

attaching inlet and outlet pipes or conduits (not shown) to therespective ends of the casing for conveying theV liquid or gas.

Upon referring to Figures 2 and 3 of the drawings, it will be observedthat the top of the casing l is formed with an `enlarged opening topermit access to the interior of the casing during construction andassembly as well as after installation of the parts in the'casing forinspection, cleaning and repairs. A removable closure 6 is provided forthe opening in the top ofthe casing and a flanged neck extends upwardlyfrom the 1 top of the casing around the opening to receive the closure6. The top of the closure is formed with a ange complementary with theange on the neck and suitable bolts 8 extend through reg- 100 isteringopenings formed in theanges'7 for .removably securing thecover inposition on the The pumping or blower unit that'is arranged with thecentra-l portion of the casing 1 includes 105 two oppositely pitched orcurved propellers or impellers 9 that are arranged to rotate in oppositedirections andare further mounted for pivotal movement in the casing soas to be balanced Awithrespect to each other about a common axis in amanner to be presently described. The hubs 10 of the propellers aremounted on and keyed to the outer ends of the propeller shaft 11 thatare journalled for rotation through the opposed sides of thev housing19.

Suitable combined radial and thrust ball or roller bearings 12 areassociated with the respective ends of the frame-like housing 19 forcooperation with the propeller shafts 11.

Keyed on the inner opposed ends of these propeller shafts 11 are thebevel gears 13 that mesh with the bevel gear 14 that is keyed on theintermediate portion'of the sectional power shaft 15`. As clearlyillustrated in Figures 1 and 2 of the drawings, the sections of thepower shaft 15 are securedtogether within the central portion of theframe-like housing 19 through the medium of the coupling 16. Suitablecombined radial and thrust ball or roller bearings 17 are arranged inthe respective ends of the tubular members 20 which 'members constitutehousings for the sections of the power shaft 15. rEhe inner ends of thetubular members 20 are secured in the respective sides of the housing 19w 'e' the outer ends of the tubular -members' 20 extend through suitableopenings provided in the front and rear sides of the `casing 1. .Onetubular member 20 is of greater length than the other as suggested moreclearly in Figures l and 2.

Removable cover plates 21 are provided for the frame-like housing 19 topermit access to' the interior of the housing and furthermore,

ing 19 and also serve to prevent the admission of foreign matter to thebearings. Combined radial and thrust ballor roller bearings 24 arearranged within the neck portions extending outwardly from the openingsin the opposite sides of. the

casing for cooperation with the respective tubular members 20. Aremovable bearing plate orl cover 26 isprovided for one of the extendedbearing portions 25, while a stuffing box and gland2'7 is provided forthe other part of the extended bearing portion.

vThe outer end of the longer section of the power shaft 15 is connectedtoand driven by a suitable motor, engine orother prime mover (not shown)through a coupling, one half of which is vthe tubular members 20 isaworm-wheel 28 and4 this worm-wheel `has meshing engagementl with theworm 29' that is supported in suitable bearings upon the bracket '34that extend'sr laterally from the casing 1. Both the worm-wheel and thelworm arm are encased within the vhousing' 30.

The Worm 29 is vmounted on the shaft 31 and the bearings for this shaftare shown at 32. A

hand-wheel 33 -is arranged on the outer end of may be briefly stated asfollows. When the parts posite direction. This is accomplished throughsition. By further rotating the propellers9, the

. tensity of the horizontal component of this thrust,

jscription, that I .have provided a balanced vathe shaft 31 foractuating the worm and-the worm-wheel. A stuffing box and glandstructure denoted generally by the numeral 35 is pro vided for the outerend of the longer section of the tubular member 20 thus affording abetter 80 yjoint between the power sha'ft 15 and the outer are arrangedas shown by the full lines in Figure 3A the two propellers or impellers9 will be disposed vertically for affording a maximum delivery and theflow of the fluid will be in the direction from left to right. In thislposition, the motor, engine or prime mover that operates the powershaft will, through the medium of the intermeshing bevel gears, impartrotary movement to the respective propellers to cause the same tooperate in opposite directions. Maximum delivery is produced because themaximum thrust is generated in the direction of ow and the axes of thepropellers 9 coincide with the axes of the inlet and outlet openings 4.

By actuating the hand wheel33, the direction of thrust of the twopropellers can be varied from its normal vertical position to anyangular position, that is, the thrust may be made to act in an inclineddirection, up-or down, or in the op'- the rotation of the worm 29 andthe coasting worm-.wheel 28 which rotates the tubular members 20 and thehousing 19 by which said mem# bers 20 are carried and as the propellersare carried by the housing, they will obviously be caused to assume anangular position as indicated by the dotted lines in Figure 3.

With the motor, engine or other prime mover A rotating at a constantspeed in one direction, a maximum thrust is produced by the propellers 9when the propellers are in their normal position. However, by incliningthe direction of thrust, the horizontal component of the thrust,producing the ow, may be varied from a maximum to zero with the axes ofthe propellers 9 in-al vertical pothrust may be made to act in theopposite direction of the normalflow and thus produce a reverse maximumflow. j

Since the quantity of ow dependson the inand'the direction of flowdepends on the direction of the horizontal component of lthis thrust, itis possible by rotating the hand wheel 33 to vary ythe .quantity ofdelivery from a maximum to zero and to also reverse the direction ofiiow, if desired,

Awith the motor, engine or other .prime mover operating at a constantspeed or at any other speed that operating conditions may demand. 'It'will' thus be seen from the foregoing desamestructure is also capable ofbeing used as a blower or compressor for'handling gases.

While I have shown the preferred embodiment of the invention, it is tobe understood that minor changes in the size, shape and arrangement ofparts rnay be resorted to without departing from iwf the spirit of theinvention and the scope of the appended claims. Having thus describedthe invention, what I xclaim is:

1. In a pump or blower structure of the class described, a. casingprovided with alined uid inlet and outlet openings, a pumping or blowerunit arranged centrally within the casing and including a housingmounted for swingable movement about .a horizontal axis, a pair ofoppositely pitched propellers mounted lon'the housing and facing therespective openings in the casing, a drive shaft extending through oneside of the casing and into said housing, propeller shafts mounted onthe housingl for supporting the respective propellers, coacting meansbetween the drive shaft and the propeller shafts for causing therotation ofthe propeller shafts in opposite directions, and means formoving the unit about its horizontal axis to position the propeller atany predetermined angle of inclination to vary the discharge of thefluid.

2. In a pump or blower structure of the class described, a casingprovided with alined fluid inlet and outlet openings, a pumping orblower unit arranged centrally within the casing and including a housingmounted for swingable movement about a horizontal axis, a pair ofoppositely pitched propellers mounted on the housing and facing therespective openings in the casing, a drive shaft extending through oneside of the casing and into said housing, propeller shafts mounted onthe housing for supporting the respective propellers, coacting meansAbetween the drive shaft andthe propeller shafts for causing therotation of the vpropeller shafts in opposite directions, and means formoving the unit about its horizontal axis to position the propeller atany predetermined angle of inclination to vary the discharge of thefluid, said last mentioned means being arranged exteriorly of the casingand being manually controlled.

3. In a pump or blower structure, a casing pro- 'vided with` alineduidinletand outlet openings, a propeller carrying unit arranged centrallywithin the casing and including a housing, rotatable tubular supportingmeans for the housing extending through the casing at an angle withrespect to the inlet and outlet openings, propeller shafts journalledfor rotation in-. the housing and arranged in alinement with saidopenings. oppositely pitched propellers carried. by the outer ends ofsaid propeller shafts, 'a rotatable power shaft extending through thetubular Fsupporting means for the housing and into the housing, in-

the power shaft for effecting the rotation of the housing extendingthrough the casing at an anpropellers in the reverse direction, andmeansfor adjusting the housing to position the propellers at anypredetermined angle of inclination within the casing to vary thequantity of delivery of the uid. s

4. In a pump or blower structure, a. casing provided with alined fluidinlet and` outlet openings, a propeller carrying unit arranged centrallywithin the casing and including a housing, rotatable tubular supportingmeans for the housing extending through the casing at an angle withrespect to the inlet and outlet openings, propeller shafts joumaled forrotation in thehous-y ing ,and arranged in alinement with said openings,oppositely pitched propellers carried by the outer ends of saidpropeller-shafts, a rotatable power shaft extending through thetubular-supporting means for the housing and into the housfing,.intermeshing gears arranged on-the inner ends of the propellershafts and the adjacent portion of the power shaft for effecting therotation of the propellers in the reverse direction, and manuallyoperable means for association with the outer end` of the tubularsupporting member to rotate the same andthe housing whereby thepropellers may be positioned at any predetermined angle of inclinationto vary the discharge of the fluid.

5. In a'pump or blower structure, a casing provided withalined fluidinlet land outlet openings, a propeller carrying unit arranged centrallywithin the casing and 1,including a hous.- ing, rotatable tubularsupporting means for the gle with respect to the inlet and outlet open-;ings, propeller shafts joumaled for rotation in the housing andarranged in alinement with said' openings, oppositely pitched propellerscarried by the outer ends of said propeller shafts, a rotatable powershaft extending thr ugh the tubular supporting means for the hous g andinto the housing, intermeshing gears arranged on the inner ends of thepropeller shafts and thev adjacent portion of the power shaft foreffecting` the rotation of-the propellers in' the reverse direction, andmanually operable means for association with the outer end of theltubular supporting member to rotate the same and the housingwherebylt'he propellers maybe posiv tioned at any predetermined 'angleof inclination to vary the discharge of the fluid, said last mentionedmeans including a worm-wheel carried by the tubular supporting member, aworm engaging the worm-wheel, a shaft carrying said worm, Supportingmeans for the shaft, and a 1'3;

vhand-wheel on one end of the worm-shaft. f

